Dawsonite

Dawsonite is a mineral composed of sodium aluminium carbonate hydroxide, chemical formula NaAlCO₃(OH)₂. It crystallizes in the orthorhombic crystal system. It is not mined for ore. It was discovered in 1874 during the construction of the Redpath Museum in a feldspathic dike on the campus of McGill University on the Island of Montreal, Canada. It is named after geologist Sir John William Dawson.

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The type material is preserved in the collection of the Redpath Museum.

See also

• List of minerals
• List of minerals named after people